As for my experience, I've been working on a visual novel project for six months now as a character artist doing the characters design as well as their sprites with multiple expressions, pose and outfit changes. I've done character design commissions for other clients as well, drawing armors, animals and even logos. I'll post some samples below:
Sprites:


Animals:


Expressions:



CG:


Concept art:






You can also check my full portfolio here: http://mgo.artstation.com/
Prices:
- Sprites: Headshot: 27$ Bust: 37$ Half body: 54$ Full body: 75$
- New expressions: 6$ each.
- Arm pose change: 16$, one arm, 21$ for two arms.
- New outfit: 25$ each.
- New hairstyle: 12$ each.
- Animal sprites: From 22$ to 62$ depending on the complexity of the animal (eg. a little rat vs a big tiger). This doesn't include anthropomorphic animals (a.k.a. furries), they go on the normal sprites section.
I also offer a Character Design Service:
- Human character design: Clothes and body type: 65$. Face and hairstyle: 40$. Clothes + head pack: 90$.
- Monster design: 45$. (Mechas and big complex monsters, like colossi, are more expensive, 80$ each).
- Weapon or accessory design: From 30$ to $45.
*Each option includes 5 sketch suggestions, which can be mixed and corrected.
- Color palettes: 15$. Includes 4 color variations in flat colors, which can be mixed and corrected too.
- Illustration finish: 13$. Clean lines and shadows over the chosen design.
*If the client needs cheaper designs, we can negotiate less options for a lower price.
You can contact me here or at mjgormaz@gmail.com
Thank you!